Summit Racing SpeedCard - learn how to get 15% back up to $150

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FAST

FAST XFI Main Wiring Harnesses

4.5 out of 5 stars 2 Customer Reviews

FAST XFI main wiring harnesses will allow you to connect the XFI ECU to the main engine wiring harness of your vehicle. They feature pre-terminated ends with special Weatherpack connectors for a perfect fit. Available for different engine configurations and styles, the FAST XFI main wiring harnesses will make the installation of your XFI ECU a lot easier.

Showing In Stock Items. Show All 6 Items.

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FAST XFI Main Wiring Harnesses 301108

FAST XFI Main Wiring Harnesses 301108

FAST XFI Main Wiring Harnesses 301108

Wiring Harness, Fast XFI, ECU, Chevy, Small Block, LS, Kit

Part Number: FST-301108

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

FAST XFI Main Wiring Harnesses 301105

FAST XFI Main Wiring Harnesses 301105

FAST XFI Main Wiring Harnesses 301105

Wiring Harness, Fast XFI, Main Harness, Universal, Kit

Part Number: FST-301105

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

FAST XFI Main Wiring Harnesses 301104

FAST XFI Main Wiring Harnesses 301104

FAST XFI Main Wiring Harnesses 301104

Wiring Harness, Fast XFI, ECU, Chrysler, Dodge, Hemi, Kit

Part Number: FST-301104

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

FAST XFI Main Wiring Harnesses 301101

FAST XFI Main Wiring Harnesses 301101

FAST XFI Main Wiring Harnesses 301101

ECU, Fast XFI, Main Harness, Chevy 1997-2004, 5.7L, Kit

Part Number: FST-301101

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

FAST XFI Main Wiring Harnesses 301100

FAST XFI Main Wiring Harnesses 301100

FAST XFI Main Wiring Harnesses 301100

Wiring Harness, Fast XFI, Main Harness, Chevy, 5.0, 5.7L, Kit

Part Number: FST-301100

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

FAST XFI Main Wiring Harnesses 301106

FAST XFI Main Wiring Harnesses 301106

FAST XFI Main Wiring Harnesses 301106

Wiring Harness, Fast XFI, ECU, for Rear Engine Dragster/Boat, Kit

Part Number: FST-301106

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

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